Steam-generator.



No; 843,497. PATENTED FEB. 5, 1907. J. SCHUTTE.

STEAM GENERATOR.

APPLICATION FILED MAR. 26, 1904- 3 SHEETS-SHEET 1.

rue NORRIS PETERS co..'WA5fHN5TcN. n. c.

STEAM GENERATOR. APPLICATION FILED MAR. 26, 1904.

s SHEETS-SHEET? THE "cams PETERS cc., WASHINGTON, a, c.

PATENTED FEB. 5. 1907. J. SGHUTTE. STEAM GENERATOR.

APPLICATION TILED MAR. 26. 1904.

3 SHEETS-SHEET 3.

J OHAN N SCHUTTE, OF

BREMERHAVEN, GERMANY.

$"l'EAi ll=GENERATi -L Specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed March 26,1901. Serial No. 200,099.

T0 (LZZ wit/27m it 7lLfbZ/ concern.-

Be it known that I, JOHANN Scniirrn, a subject of the German Emperor, a resident of Bremerhaven, free and Hansa town Bremen, Empire of German J 7 I 7 invented new and useful improvements 1n and Connected with Steam-Generators, of

which the following is a specification.

This invention relates to a steam-boiler, more particularly intended for marine purposes, but also adaptable for use on land.

The characteristic features of the boiler consist of a lire-tube boiler being combined with a water-tube boiler and by its also having a further property that the fire-tube boiler is heated by a fire beneath it in similar manner to what is done in the case of many stationary boiler installations. The tiretube boiler may be made cylindrical or oval. A boiler constructed according to these points of view combines the advantages of the ordinary cylindrical marine boiler 'ith return-flame, with these of the water-tube boilerthat is to say, such a boiler raises full stean1-pressure in a considerably shorter time than a similarly-sized cylindrical boiler and has a very good water circulation both at the COlfiT-XQHCEDIODT of the thing and also l I working, and the coal con sunnotion la consequence of this water circulation and of the fire beneath it is less than is the ease of a good fire-tube boiler with internal firing. The boiler also viola a very high percentage of evaporation oer l gram of coal consumed without its be. necessary to employ any artificial draft or blast, and it is about forty-five per cent. lighter than an ordinary cylindrical marine boiler with returning flame.

Three forms of construction of this improved boiler are shown as an example in the accompanying drawings.

Figure 1 is a vertical longitudina of a form of construction of this combi boiler prov' led with a circular the t boiler. Fig. 2 is a cross-section on the 11 e A A of Fig. 1. 3 is a front view of a third form of construction of the combined boiler, in which the fire-tube boiler is of oval section. The smoke-chamber which faces the person looking at it, and 1S theretore really visible, is in this figure shown in dotted lines. d is a horizontal section of this boiler on the line B B of Fig. 3. Fig. 5 is a central vertical section of the boiler.

naval architect, have 1 indicates a fire-tube boiler which is assumed to be cylindrical and is heated by a 5 fire beneath it. The iire is attended to in l the ordinary manner through a fire-door and ash-pi A water-tube boiler is arranged behind the tire-tube boiler 1 and consists of a 1 lower water chamber or drum 1, lying transversely, and an, uoper chamber or drum 10, serving for receiving steam and water, and tubes 12 16 17 connecting the two drums.

The flames and furnace gases before reachin the fire-tubes 2 of the boiler 1 pass through the group of water-tubes 12 16 17 that is to say, must more or less play around tubes 1217. In order to prevent too much heat being imparted to the space behind the watertul; e l oil-er, the second row 16 tubes is bent in such a way that the separate tubes 16 for the greater part of their leigth lie in the paces between the tubes 17. in this way a kind of water-wall is formed, which forms a ve good protection against too much heat be g given off to the rear. in order to prove-it the escape of furnace gases through the unavoidable space still left between the tubes 16 and 17, a Wall 18, of suitable n roof material, is provided, which fits tightly against the two chambers or drums d and 10. it is necessary for the water-tube boiler to be entirely inclosed at the sides 211C roar (as shown, for instance, by the wall for the back of the boiler) in order to avoid direct admission of cold air to the cries of tubes 1247. in order to force the flame and furnace -gases to pass first througl group of tubes of the water-tube such a height that a free connection of the possible through remaining steam-spaces is the pipe 11. In order to allow of the connection between the lower parts of both boilers necessary or obtaining a constant circulation of water between the fire-tube boiler and the water-tube boiler being obtained, two

fully large pipes 8 and 9 are provided in the form of construction shown in Fig. 4.

In order to be able to take off the water as far as possible from the absolute bottom of the fire-tube boiler, it is preferable to allow one of the two tubes-for instance, 8, as shown in Fig. 4to penetrate to a considerable extent into the boiler, so that it mainly draws water from the proximity of the rear tubular wall and the other tube 9 to penetrate only a little way, or even not at.all, into the fire-tube boiler, so that this tube 9 mainly draws water from the proximity of the front tubular wall. In this manner sludge is prevented accumulating on the bottom of the boiler and baking fast thereon in a manner dangerous to the boiler under the action of the fire, which action is particularly strong here. Owing to the relatively small pipes 8 and 9 connecting with the wide transverse drum 4, a rapid diminution in the speed of the circulating water is produced in the latter, whereby any dirt and sludge contained in the transverse drum 4 falls to the bottom and may be expelled as required through a sludge-cock located at the lowest point of said boiler. In this form of construction the drum 10, which is connected with the firetube boiler 1 by the pipe 11, is raised, so that its lower edge stands above the highest water-level, and it is thus only traversed by the water thrown up by the pipes 12*17that is to say, the water cannot be stationary in the pipe 11. The steam carried along with this water is able, however, to become separated in the boiler-drum 10, and is conveyed by a pipe 45 in the dome 46 of the fire-tube boiler 1. In order to prevent too much of the water thrown up by the tubes 1217 from being carried up into the chamber-drum 10 and getting with the steam through 45 into 46, a baffle-plate 47 is arranged, which is only provided in its lower part with suitably-diminished apertures 48 for the passage of the Water and steam. It is evident from Fig. 1 that the water retained by this baffle-plate can fiow off without further difficulty through the inclined pipe 11, which is mounted in a part 49 of the rear wall of the fire-tube boiler, which part of this object is also made sloping.

In the form of construction shown in Figs. 3 and 4 fire-tube boiler 1 is oval in section and suitably stiffened by perforated sheet metal stay-bars 22 and stays 23, while the water-tube boiler, in addition to being connected with the transverse drum 4, is also connected with longitudinal drums 24. Two circulation-pipes 8 and 9 also connect with these drums, one, 8, of which pipes takes the water from the proximity of the rear boiler wall and the other, 9, from the proximity of the front boiler-wall of the fire-tube boiler. The upper drum 10 of the water-tube boiler in this form of construction does not he behind the fire-tube boiler, but above it. The connection of the drum 10 with the boiler 1 is established by means of a collar-like pipe 25, which in horizontal section is elongated. second similar drum 26 serves as steam-accumulator and for the actual connection with the main steam-pipe. In order to be able to introduce into the fire-tube boiler as large a number of fire-tubes 2 as possible, which in Fig. 3 are only shown above and below in dotted lines for the sake of more clearly showing the other parts of the boiler, it is preferable in this form of construction to dispense with an actual steam-chamber in the fire-tube boiler and to establish the necessary communication between chambers 10 and 26 by a separate largo pipe 27 In this form of construction the circulation of the water takes place in exactly the same manner as in the form of construction shown in Figs. 1 and 2, as here also the water is introduced through the pipes 8 and 9 into the lower drums 24 of the water-tube boiler, in which also any sludge can accumulate without doing harm, and said water passes out of these drums through the strongly-heated water-tubes 12-17 to the upper drum 10, which allows it to flow back again to the firetube boiler 1 through the pipe 25. As a vigorous heating of the Water-tubes 1217 in both forms of construction, Figs. 1, 2, and 3, takes place already at the commencement of the firing of the boiler, steam is formed in the small tubes very soon after the fire is lighted, and the water circulation commences very soon and very powerfully of itself, as mentioned at the beginning of this specification, without the help of any special means. This circumstance that a vigorous circulation of the water through the lire-tube and watertube boilers comes into action very soon after the starting of the fire allows the boiler to be heated in about a fifth of the time which is necessary in an ordinary fire-tube boiler with internal heating for obtaining a full working pressure.

Where oval fire-tube boilers are used, it is difficult to avoid exposing the rivet-seams and stay-bolt heads to the direct action of the fires. These rivet-seams and stay-bolts are, however, so deleteriously affected by the admission of cold air to the fire, which is unavoidable when stoking, th at they easily become leaky. This ated by arranging under the oval bottom of the fire-tube boiler, as shown in the form of construction in Figs. 35, a number of airtubes-2S, formed of fireproof material, which tubes are preferably provided with side flanges and are arranged so close together that the flame cannot directly encounter the bottom of the boiler. By allowing air to constantly flow through these tubes their premature destruction can be avoided. The

di'l'liculty may be obvi- When the quantity of air admitted through the pipes 28 to t;1e rear combustioncrizunber of the boiler is correctly calculated, it very much assists in pro ducing a complete combustion of the smoke evolv l, more iCLiitlllf' when fuel is freshly thrown on. hot I el-iiin as my inventin and desire to secure b Letters Patent, is-

1. In n stain-boiler the combination of e fire-ti ,-e boiler hgving the top part of its rezr well 1 tied, steam-chamber above I 5 wster-lwel cf the fire-tube boiler, roe

shirt tube f.;rn"- e .pen eonnestiun bebciler and s;.id steiznllower epen end of s id rooniy eted to the inclined top pert f the fire-tube be'ler, s. we-

er-tubes the eonnett said wlth the StBILU'i-Gll? ii. er, and 3 m w the fire-tube boiler, as set l-bc-iler the com ination of a steam-chamber err ng'ed eve i the lire-tube 1 iler, the iornnng' an epen connecthc firetube beiler and said tub b assrn throu h i resting-tube anti adi sted t5) l'ni ste f the steam-shah i-er into the -re;civer the fire-tube b 31.91, wet erber, wider-tubes connect 's id wry-ter- 3 5 nor with the ste: he i" the lire-t ibe be ;;iler the es ""ne pertzfits rear -eh:.:i.i,er above the 4.0 of the firetube boiler, :1 riioinjr hinvilw' its lower open end eoni of the r er in open iOC-IlGI and #5 be passing 111;: from the ste. .:n-e into the I'G-f-GlTCl cf the fire-tut o .;iler, n. wer L, d water-tubes eonieeting 5o idw;-ter-ehznhl'zerwiththe stesrn-eh zber, and lire-grete below the firetube boiler, as set f. rrh.

l. stern .uciler the eo-inbir etion of .l firetube boiler hnving' the to s re;:.r well inelined, e. steam-shrun- ..ove the water-level of the fire-tube .iier, reonr short tube f rniine' an open s isn between the fire-tube bciler end SLG 1i11-Ol1i1'i1ll6l, the lower open end of )0 sxid lJCillff tube being conneeted to the inc lilfitl pgrt of the rear vnll cf the lireer, e rater-chamber, \VQiGT-bllbGS said water-chamber with the steein-ehhinber, and a fire-gete below the i5 lire-tube boiler, as set forth.

l J l l l I I l i i l i It i l 1 l f i i l l below the fire-tube 5. In a steam-boiler the combination of e eylindr'eel fire-tube boiler, e, steeni-eheinber arranged above the Wit'iLGT-lQVQl the firetube boiler, roznn T she tube forming an open connection between the fiietiil e boiler and siid stemn-elr ber, e, stei. ing through the rceu v eonnee o eondi stezzn from the steam-eh e stemrrreeeiver cf the fire-tube be er, a we.- ter-ehsi. i. s ster-tubes connecting said w ter-ehernbor w'th the stesrn-ehssnber, and e fire-grate below the fire-tube boiler, as set forth.

6. In a stesnn-boiler the combination of a lindr'eel lire-tube bciler hsving the top t of its rear wall ineliner, a steam-chainber ebsve the w;.terlevel of the firetube boiler, roe iv short tube forming en open eonneetion between the fire-tube boiler and said steam-obs. r, the lower open nd of said rooi O'Qiilf" esnneeted to the inclined top pert ef the rear wall of the firetube boiler, a stee ll-tube possin; through the rooinyeonne "-tube and conducting steel-n1 ber, v =.tertub es eonneet he; suid wmter-hsnrber with the ste ni-ehrnnber, end firegmt boiler, se forth.

7. In a steam-boiler the combination of a fire-tube boiler, a steam-chamber above the waiter-level of lire-tube boiler, a roomy short tube form 3- en open connection between the fire-tube boiler sendv steamehztinber, e water-chamber, water-tubes connecting said water-clan nber wl the steelmchamber, a fire-gate below the "ire-tube boiler, two roornv enter-tubes cor "i:

the fire-tube bo ler w. of the water-tube bo'l tubes one; tube boile the froi'it W h th e1, one

all 0 the other qtasse tcntls therein t e bwl; well of fretube boiler, as set f the combination of a Q; the ten art of its rear steein-ehninber ebove the W W'ZLLQT-lEVGi of the l re-tube boiler, a roomy sh rt tube forming an 0;?011 eel see on between the f: "7 tube boiler and steamchernber, er swing its low r end connector? to the inc e. to of the rear wall of the fire-tube boiler, watenchaniber, tubes connecti e s water-chamber with the St&111l121111i31, e fire-grate provided below tfie fire-tube boi two roomy watertubes, connecting the fire-tube boiler with the water-chamber of the water-tube boiler, one of seie. rooinv tubes being connected. to the front wall of th lire-tube boiler, and the other cassing' t rough the front wall of the fire-tube boiler and. eXtenT -ing therein to a point near the back well thereof as set forth.

9. In a steam-boiler the combination of a T s throu h fire-tube boiler, a steam-chamber above the l steam-chamber, the lower water-level of the fire-tube boiler, a roomy short tube forming an open connection between the fire-tube boiler and said steamchamber, a steam-tube passing through the roomy connecting-tube and adapted to lead steam from the steam chamber into the steam-dome of the fire-tube boiler, a waterchamber, water-tubes connectin said chamber with the steam-chamber, a 're-grate below the fire-tube boiler, two roomy watertubes connecting the fire tube boiler with the water-chamber of the water-tube boiler, one of said. water-tubes opening into the front of the fire-tube boiler, while the other passes through the front wall of the fire-tube boiler, and opens therein near the back wall thereof.

10. In a steam-boiler the combination. of a fire-tube boiler having the top part of its rear wall inclined, a steam-chamber above the water-level of the fire-tube boiler, a roomy short tube forming an open connection between the fire-tube boiler and said steamchamber, the lower open end of said roomy tube being connected to the inclined top part of the rear wall of the fire-tube boiler, a steam-pipe passing through the said connecting-tube and adapted to lead steam from the steam-chamber into the fire-tube boiler, a water-chamber, water-tubes connecting said chamber with the steam-chamber, a firegrate provided below the fire-tube boiler, two roomy water-tubes, connecting the firetube boiler with the water-chamber of the water-tube boiler, one of said water-tubes being connectei to the front wall of the firetube boiler, while the other passes through the front wall of the fire-tubeboiler, and has its inlet near the back wall thereof.

11. In a steam-boiler the combination of a cylindircal fire-tube boiler, a steam-chamber arranged above the water-level of the firetube boiler, a roomy short tube forming an open connection between the fire-tubeboiler and said steam-chamber, a water-chamber, water-tubes provided to connect said waterchamber with the steam-chamber, a fire grate below the fire-tube boiler, two watertubes, connecting the fire-tube boiler with the water-chamber of the water-tube boiler, one of said tubes opening into the front of the fire-tube boiler, while the other passes through the front wall of the fire-tube boiler and opens therein near the back wall thereof.

12. In a steam-boiler the combination of a cylindrical firetube boiler having the top l part of its rear wall inclined, a steam-chamber above the water-level of the fire-tube boiler, a short tube forming an open connection between the fire-tube boiler and said connected to the water-chamber of the waterend of said tube [being connected to the inclined part of the rear wall of the fire-tube boiler, a waterchamber, water-tubes connecting said waterchamb er with the steam-chamb er, a fire-grate below the fire-tube boiler, two water-tubes tube boiler, one of said tubes being also connected to the front wall of the fire-tube boiler, while the other tube passes through the front wall of the fire-tube boiler, and has its inlet near the back wall th ereof as set forth.

13. In a steam-boiler the combination of a cylindrical firetube boiler, a steam-chamber above the water-level of the fire-tube boiler, a roomy short tube forming an open connection between the fire-tube boiler and said steamchamber, a steam-tube passing through the roomy connecting-tube and conducting steam from the steam-chamber into a steam-receiver of the fire-tubeboiler, a water-chamber, water-tubes connecting said Waterchamber with the steam-chamber, a fire-grate below the fire-tube boiler, two roomy water-tubes, connecting the fire-tubeboiler with the waterchamber of the water-tube boiler, one of said roomy tubes being connected to the front wall of the fire-tube boiler, while the other passes through the front wall of the fire-tube boiler and opens thereinto near the back wall thereof as set forth.

14c. In a steam-boiler the combination of a cylindrical fire-tube boiler having the top part of its rear wall inclined, a steam-chamber above the water-level of the fire-tube boiler, a roomy short tube forming an open connection between the fire-tube boiler and said steam-chamber, the lower end of said tube being connected to the inclined top part of the rear wall of the fire-tube boiler, a steamtube passing through the roomy connectingtube and conducting steam from the steamchamber into the fire-tube boiler, a waterchamber, water-tubes connecting said waterchamber with the steam-chamb er, a fire-grate below the fire-tube boiler, two water-tubes, connecting the fire-tube boiler with the waterchamber of the water-tube boiler, one of said water-tubes being connected to the front wall l of the fire-tube boiler, while the other passes through said front wall and has its inlet end near the back wall of the fire-tube boiler, as set forth.

In testimony whereof I have signed my 1 name to this specification in presence of two subscribing witnesses. 1 JOHANN SCHUTTE. l Witnesses: W. BERKER, BRIDERMANN. 

